Well WAB V Geo HT

WAB® for geothermal applications

High temperature all metal expandable packers

Introduction

Geothermal energy offers the highest capacity factor in the renewable market and requires a consistently high temperature fluid flow to ensure a reliable output.

Welltec® offer multiple solutions using an all metal expandable packer to assist operators in various stages of drilling and completion. The Welltec Annular Barrier (WAB®) can be incorporated into helping achieve challenging high temperature cement jobs during new well construction, enable the sustainable rejuvenation of existing shut in wells via re-lining and provide open hole isolation for Enhanced Geothermal Systems (EGS) and stimulations.

Geothermal well construction requires high temperature packers combined with cement to enhance integrity and protect the life span of the wellbore. These solutions also provide zonal isolation for stimulation and facilitate the remediation of wells that are shut-in due to casing collapse, burst or buckling, a common issue in this sector.

Current designs of the WAB are qualified for 260 > 300°C, which can be used for injection and production wells with the possibility of modifications to address specific requirements.

 

  • Challenge
    Geothermal applications
  • Applications
    Enhanced Geothermal Systems
    High temperature well construction packer
All Metal WAB
Well WAB V Geo HT Small
All Metal WAB 2

Case highlight

CHALLENGE
High temperature - Power generation

A geothermal well operator had to shut in one of its most prolific producers due to the failure of the 9 5/8” casing and the loss of the 7” slotted production liner – the result of acid corrosion...

Read Case

Overview

Our ISO 14310 rated, all metal expandable WAB (Welltec Annular Barrier) is expanded between the base pipe and the casing or the borehole by applying pressure in the casing. It conforms to the actual well bore geometry or casing internal diameter, providing metal to metal or metal to rock contact, and high strength anchoring capability.

Once the WAB is set, casing Integrity is re-instated via internal hydraulic isolation mechanism.
The WAB can be mounted and welded onto any base casing in a simple and cost-effective way. Both ends are therefore fixed and provide life of well protection to the expanded WAB sleeve.
Well WAB Vert 00000 HT Geothermal
Well WAB Hori 00000 HT Geothermal

Applications - well construction:

  • Open hole & cased hole 2nd stage cement support
  • Standalone open hole isolation
  • Open hole & cased hole cement assurance
  • Platform for 2nd stage cement during relining shut in wells
  • Cross flow isolation
  • Liner / casing hanger

Applications - zonal isolation:

  • Enhanced Geothermal Systems
  • Cold water isolation
  • High pressure oh isolation for stimulation
  • Replace cement
  • Suitable for all formation types and borehole geometries

Features

  • Rugged, all welded, metallic construction
  • Optional isolation of expansion port
  • Expansion assurance in multi-WAB applications
  • High temperature capability
  • High expansion capability
  • Constant, high pressure ∆p over full expansion range
  • No premature expansion
  • NACE compliant
  • Control line feedthrough optional – to communicate with hyd. activated devices

Benefits

  • Rotatable during deployment enabling liner to TD in challenging environments
  • Deployable through milled / damaged casing
  • Slim OD allows for high rate circulation during deployment
  • Rapid set nature of WAB reduces time to production
  • High rate circulation capability
  • Full bore – as per casing / tubing

Specifications range*

Expansion range 8.50” 14.0”
Min. running OD 8.250” 11.380”
Max. working pressure 6,000 psi 10,000 psi
Constant element ΔP across expansion range 6,000 psi 10,000 psi
Base pipe range 7” 9 7/8”
Standard element length 7.2 ft
Temperature 572°F
ISO14310 Standard Up to V0
ID Full bore (as per base pipe)